<template>
    <div>
        <div class="goods">
            <div class="menu-wrapper">
                <ul>
<!--                    :class="{current: index===currentIndex}" @click="clickMenuItem(index)"-->
                    <li class="menu-item" v-for="(good, index) in goods" :key="index" :class="{current: index===currentIndex}" @click="clickMenuItem(index)">
                        <span class="text bottom-border-1px">
                          <img class="icon" :src="good.icon" v-if="good.icon">
                          {{good.name}}
                        </span>
                    </li>
                </ul>
            </div>
            <div class="foods-wrapper">
                <ul ref="foodsUl">
                    <li class="food-list-hook" v-for="(good, index) in goods" :key="index">
                        <h1 class="title">{{good.name}}</h1>
                        <ul>
                            <li class="food-item bottom-border-1px" v-for="(food, index) in good.foods"
                                :key="index" >
                                <div class="icon">
                                    <img width="57" height="57" v-lazy="food.icon" @click="showFood(food)">
                                </div>
                                <div class="content">
                                    <h2 class="name">{{food.name}}</h2>
                                    <p class="desc">{{food.description}}</p>
                                    <div class="extra">
                                        <span class="count">月售{{food.sellCount}}份</span>
                                        <span>好评率{{food.rating}}%</span>
                                    </div>
                                    <div class="price">
                                        <span class="now">￥{{food.price}}</span>
                                        <span class="old" v-if="food.oldPrice">￥{{food.oldPrice}}</span>
                                    </div>
                                    <div class="cartcontrol-wrapper">
                                        <CartControl :food="food"></CartControl>
                                    </div>
                                </div>
                                <Food :food="food" ></Food>
                            </li>
                        </ul>
                    </li>
                </ul>
            </div>
            <ShopCart></ShopCart>
        </div>
        <Food :food="food" ref="food"/>
    </div>
</template>

<script>
    import BScroll from '@better-scroll/core'
    import CartControl from '../../components/CartControl/CartControl'
    import Food from '../../components/Food/Food'
    import ShopCart from '../../components/ShopCart/ShopCart'
    import {mapState} from 'vuex'
    export default {
        name: "ShopGoods",
        components:{
            Food,
            CartControl,
            ShopCart,
        },
        data() {
            return {
                foodsScrollY:0,
                menuScrollY:0,
                tops:[],
                menuTops:[],
                food:{},
            };
        },
        computed: {
            ...mapState(['goods']),
            currentIndex(){
                let {foodsScrollY,tops}=this;
                let res=0;
                tops.forEach((item,index)=>{
                    if (item<=foodsScrollY){
                        res =index
                    }
                });
                return res
            }
        },
        methods: {
            intScroll(){
                this.menuScroll = new BScroll('.menu-wrapper');
                this.foodsScroll =    new BScroll('.foods-wrapper',{
                    probeType: 3,  // 惯性滑动不会触发
                });
                this.foodsScroll.on( 'scroll',({y}) => {
                    this.foodsScrollY = Math.abs(y)
                })
            },
            initTops(){
                let tops = [0], top  = 0;
                let lis=document.querySelectorAll('.food-list-hook');
                lis.forEach(item=>{
                    tops.push(top +=item.clientHeight)
                });
                this.tops=tops;
            },

            clickMenuItem(index){
                const scrollY = this.tops[index];
                // 平滑滑动右侧列表
                this.foodsScroll.scrollTo(0, -scrollY, 200);
                // 立即更新scrollY(让点击的分类项成为当前分类)
                this.foodsScrollY = scrollY;
            },
            showFood (food) {
                // 设置food
                this.food = food;
                // 显示food组件 (在父组件中调用子组件对象的方法)
                this.$refs.food.toggleShow()
            }
        },
        created() {
        },
        mounted() {
            if (this.goods.length===0) {
                this.$store.dispatch('getShopGoods',()=>{
                    this.$nextTick(()=>{
                        this.intScroll();
                        this.initTops();
                    })
                });
            }else {
                    this.intScroll();
                    this.initTops();
            }
        },
    }
</script>

<style lang="stylus" rel="stylesheet/stylus">
    @import "../../common/stylus/mixins.styl"
    .goods
        display: flex
        position: absolute
        top: 195px
        bottom: 46px
        width: 100%
        background: #fff;
        overflow: hidden
        .menu-wrapper
            flex: 0 0 80px
            width: 80px
            background: #f3f5f7
            .menu-item
                display: table
                height: 54px
                width: 56px
                padding: 0 12px
                line-height: 14px
                &.current
                    position: relative
                    z-index: 10
                    margin-top: -1px
                    background: #fff
                    color: $green
                    font-weight: 700
                    .text
                        border-none()
                .icon
                    display: inline-block
                    vertical-align: top
                    width: 12px
                    height: 12px
                    margin-right: 2px
                    background-size: 12px 12px
                    background-repeat: no-repeat
                .text
                    display: table-cell
                    width: 56px
                    vertical-align: middle
                    bottom-border-1px(rgba(7, 17, 27, 0.1))
                    font-size: 12px
        .foods-wrapper
            flex: 1
            .title
                padding-left: 14px
                height: 26px
                line-height: 26px
                border-left: 2px solid #d9dde1
                font-size: 12px
                color: rgb(147, 153, 159)
                background: #f3f5f7
            .food-item
                display: flex
                margin: 18px
                padding-bottom: 18px
                bottom-border-1px(rgba(7, 17, 27, 0.1))
                &:last-child
                    border-none()
                    margin-bottom: 0
                .icon
                    flex: 0 0 57px
                    margin-right: 10px
                .content
                    flex: 1
                    .name
                        margin: 2px 0 8px 0
                        height: 14px
                        line-height: 14px
                        font-size: 14px
                        color: rgb(7, 17, 27)
                    .desc, .extra
                        line-height: 10px
                        font-size: 10px
                        color: rgb(147, 153, 159)
                    .desc
                        line-height: 12px
                        margin-bottom: 8px
                    .extra
                        .count
                            margin-right: 12px
                    .price
                        font-weight: 700
                        line-height: 24px
                        .now
                            margin-right: 8px
                            font-size: 14px
                            color: rgb(240, 20, 20)
                        .old
                            text-decoration: line-through
                            font-size: 10px
                            color: rgb(147, 153, 159)
                    .cartcontrol-wrapper
                        position: absolute
                        right: 0
                        bottom: 12px
</style>
